1 files changed, 110 insertions, 0 deletions
diff --git a/otfl-node-res.lua b/otfl-node-res.lua
new file mode 100644
index 0000000..c8d815b
--- /dev/null
+++ b/otfl-node-res.lua
@@ -0,0 +1,110 @@
+if not modules then modules = { } end modules ['node-res'] = {
+    version   = 1.001,
+    comment   = "companion to node-ini.tex",
+    author    = "Hans Hagen, PRAGMA-ADE, Hasselt NL",
+    copyright = "PRAGMA ADE / ConTeXt Development Team",
+    license   = "see context related readme files"
+}
+
+local gmatch, format = string.gmatch, string.format
+local copy_node, free_node, new_node = node.copy, node.free, node.new
+
+--[[ldx--
+<p>The next function is not that much needed but in <l n='context'/> we use
+for debugging <l n='luatex'/> node management.</p>
+--ldx]]--
+
+nodes = nodes or { }
+
+local reserved = { }
+
+function nodes.register(n)
+    reserved[#reserved+1] = n
+    return n
+end
+
+function nodes.cleanup_reserved(nofboxes) -- todo
+    nodes.tracers.steppers.reset() -- todo: make a registration subsystem
+    local nr, nl = #reserved, 0
+    for i=1,nr do
+        free_node(reserved[i])
+    end
+    if nofboxes then
+        local tb = tex.box
+        for i=0,nofboxes do
+            local l = tb[i]
+            if l then
+                free_node(tb[i])
+                nl = nl + 1
+            end
+        end
+    end
+    reserved = { }
+    return nr, nl, nofboxes -- can be nil
+end
+
+function nodes.usage()
+    local t = { }
+    for n, tag in gmatch(status.node_mem_usage,"(%d+) ([a-z_]+)") do
+        t[tag] = n
+    end
+    return t
+end
+
+local pdfliteral = nodes.register(new_node("whatsit",8))   pdfliteral.mode = 1
+local disc       = nodes.register(new_node("disc"))
+local kern       = nodes.register(new_node("kern",1))
+local penalty    = nodes.register(new_node("penalty"))
+local glue       = nodes.register(new_node("glue"))
+local glue_spec  = nodes.register(new_node("glue_spec"))
+local glyph      = nodes.register(new_node("glyph",0))
+local textdir    = nodes.register(new_node("whatsit",7))
+
+function nodes.glyph(fnt,chr)
+    local n = copy_node(glyph)
+    if fnt then n.font = fnt end
+    if chr then n.char = chr end
+    return n
+end
+function nodes.penalty(p)
+    local n = copy_node(penalty)
+    n.penalty = p
+    return n
+end
+function nodes.kern(k)
+    local n = copy_node(kern)
+    n.kern = k
+    return n
+end
+function nodes.glue(width,stretch,shrink)
+    local n, s = copy_node(glue), copy_node(glue_spec)
+    s.width, s.stretch, s.shrink = width, stretch, shrink
+    n.spec = s
+    return n
+end
+function nodes.glue_spec(width,stretch,shrink)
+    local s = copy_node(glue_spec)
+    s.width, s.stretch, s.shrink = width, stretch, shrink
+    return s
+end
+function nodes.disc()
+    return copy_node(disc)
+end
+function nodes.pdfliteral(str)
+    local t = copy_node(pdfliteral)
+    t.data = str
+    return t
+end
+function nodes.textdir(dir)
+    local t = copy_node(textdir)
+    t.dir = dir
+    return t
+end
+
+statistics.register("cleaned up reserved nodes", function()
+    return format("%s nodes, %s lists of %s", nodes.cleanup_reserved(tex.count["lastallocatedbox"]))
+end) -- \topofboxstack
+
+statistics.register("node memory usage", function() -- comes after cleanup !
+    return status.node_mem_usage
+end)